[Image of a state chart diagram for a library management system]
States:
* Initial: This is the initial state of the system.
* Login: Users can log in to the system using their username and password.
* Main Menu: After successfully logging in, users are presented with the main menu, which provides options to search for books, check out books, return books, and manage their account.
* Search Books: Users can search for books by title, author, or ISBN number.
* Check Out Books: Users can check out books by selecting them from the search results and specifying the number of days they want to borrow the books for.
* Return Books: Users can return books by selecting them from their account and specifying the date they returned the books.
* Manage Account: Users can manage their account by changing their password, updating their contact information, and viewing their checkout history.